<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>浅蓝彼岸-首页</title>
    <style>
      body {}

      .header {
        height: 50px;
        line-height: 50px;
        border: 1px solid red;
        margin: 0px auto;
        padding-left: 50px;
        background-color: aqua;
      }

      .zhuti {
        height: 800px;
        background-color: aquamarine;
      }
    </style>
  </head>
  <body>
    <div class="header"></div>
    <div class="zhuti"></div>
  </body>
</html>